Filing an Amended Individual Income Tax Return
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Did you make an error or forget to report information on your tax return?
If you find yourself in this situation, you must file an amended income tax return.
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How do I file an amended return?
File Form IL-1040-X, Amended Individual Income Tax Return, if
- you discover that you made an error on your Illinois return after it was filed, or
- your federal return has been adjusted either by the Internal Revenue Service (IRS) or on a 1040X, Amended U.S. Individual Income Tax Return, you filed; the change affects your Illinois income, additions, subtractions, exemptions, or credits; and the change is final.
Note: If the federal change results in a refund, do not file Form IL-1040-X until you receive notification that your change has been accepted by the IRS.
For more information, see Form IL-1040-X and instructions (Español).
What if I need tax assistance?
If you have any last minute questions about your IL-1040 Individual Income Tax Return, or other tax-related topics, give us a call. Our staff will be available until 7:00 PM tonight.
- 1 800 732-8866 or 217 782-3336
- 1 800 544-5304 TTY
Over-the-phone translation services are available.
Resources
For the most up-to-date information, printable forms, schedules, and instructions for the 2023 tax year, please visit IDOR’s website at: tax.illinois.gov.
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